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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Gyroscope: Precession01:24

Gyroscope: Precession

Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Gyroscope01:02

Gyroscope

A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...

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Updated: May 21, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

Published on: May 27, 2021

スピン・オービト・エコー

N Sugimoto1, N Nagaosa

  • 1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

Science (New York, N.Y.)
|June 16, 2012
PubMed
まとめ
この要約は機械生成です。

スピンの情報は,分散を生き残る保存された"ねじれたスピン"によって保存されます. 予測されたスピン軌道エコー現象は,シミュレーションで確認されたリラックス後でもスピン回復を示しています.

さらに関連する動画

Echo Particle Image Velocimetry
16:31

Echo Particle Image Velocimetry

Published on: December 27, 2012

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

関連する実験動画

Last Updated: May 21, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

Published on: May 27, 2021

Echo Particle Image Velocimetry
16:31

Echo Particle Image Velocimetry

Published on: December 27, 2012

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

科学分野:

  • スピントロニクス (Spintronics) は,スピントロニクス (Spintronics) を開発したものです.
  • 量子情報科学とは,量子情報科学である.
  • 凝縮物質物理学 凝縮物質物理学

背景:

  • 量子スピン情報を保存することは,スピントロニクスにとって極めて重要です.
  • 固体におけるスピン-軌道相互作用 (SOI) は,スピンの寿命を制限する.
  • 乱れ散乱は通常,スピンコヒーレンスを劣化させる.

研究 の 目的:

  • 固体におけるスピン情報を保存するメカニズムを調査する.
  • スピンダイナミクスにおける保存量数の役割を探求する.
  • 新しいスピン現象を予測し,検証するために.

主な方法:

  • スピン-軌道相互作用下でのスピンダイナミクスの理論分析.
  • 隠された保存量の識別: "ねじれた回転".
  • 予測された現象を確認するための数値シミュレーション.

主要な成果:

  • スピンの情報は,アディアバティックインヴァリアントである"ねじれたスピン"によって保存されます.
  • この保存されたスピンは,弾性障害の分散を生き残ります.
  • "スピン・オービタ・エコー"現象が予測され,数値的に確認された.

結論:

  • "ねじれたスピン"は,堅固なスピン情報保存への道を提供します.
  • スピン・オービタ・エコーは,スピン・リカバリー・ポスト・リラクゼーションの可能性を示しています.
  • 2D半導体量子井戸での実験的検証が提案されています.